So the 323i comes with halogens... are xenon's an option? If not can it be specially requested?

no.

only way you are gonna get xenon's on a 323i are if you buy the euro's (clear reflectors) or a set of xenon's that someone has for sale since they swapped out to euro's. will need ballasts and modules to complete this setup. look at spending around ~$1300 for a complete setup